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平原区包括一般沿江、沿湖、沿海平原和山间盆地平原两类。就长江流域而言,前者有洞庭湖平原、江汉平原、鄱阳湖平原、太湖平原、长江中下游沿江平原和江苏、浙江沿海平原。后者有成都盆地、汉中盆地和南阳盆地。地下水评价对象是与大气降水和地表水体有直接联系的浅层地下水,一般仅评价矿化度小于2g/L的多年平均淡水资源,以现状条件为评价基础,以水均衡法为主评价出各项补给量和排泄量。
The plains area includes two types: general along the river, along the lake, coastal plains and mountain basin plain. In terms of the Yangtze River Basin, the former includes the Dongting Lake Plain, the Jianghan Plain, the Poyang Lake Plain, the Taihu Lake Plain, the Yangtze River Plain in the middle and lower reaches of the Yangtze River, and the Jiangsu and Zhejiang coastal plains. The latter includes the Chengdu Basin, the Hanzhong Basin and the Nanyang Basin. Groundwater assessment objects are shallow groundwater that is directly related to precipitation and surface water. Generally, only the average annual freshwater resources with a salinity of less than 2 g / L are evaluated. Based on the current conditions and the water balance method, Item replenishment and excretion.